When Regurgitant volume (74mL) is more than a healthy heart output

I'm missing something. My TEE results show a "Severe" regurgitant of 74mL @ the mitral valve prolapse. So I decided to look up the normal output of a healthy heart to see what percentage I was loosing with 74mL. Turns out, more than 100%! A healthy heart pumps about 70mL per stroke.
But... I'm not dead or on a heart bypass machine. In fact, I'm fairly fit at 70 this month, still swimming my IMs and biking on alternate days.
My only guess is that my heart is sucking in WAY more than 70mL to begin with. Whereas a healthy non-leaking heart only sucks in the actual 70mL that it then pumps through....?
If my EF is 50% as indicated, does that mean it's sucking in 140mL? The results don't show what the actual output is.
And, I didn't have any of these questions in my head for the cardiologist when I woke from the TEE. :-/
Anyone here familiar with this?